iran is facing dust storms every year and frequently. this phenomenon has affected, especially in recent years, various aspects of people's lives. the aim of this research is iran’s seasonal clustering in terms of dust storms frequency with visibility less than 1000 and 500 m for the period of 1987–2008. for this purpose, we used the data of 87 synoptic stations that had suitable spatial d...

The evolutionary origin of extant species has been largely debated. The controversy is especially vivid in the Neotropics, one of the more biodiverse regions of the world. One hypothesis is that Neotropical species emerged primarily during the Quaternary (the last ~2 million years), favored by the alternating glacial/interglacial climates. An opposite view proposes an older Tertiary origin link...

Period Batch Control was developed and ®rst applied during the Second World War. The historic roots are discussed and the principles of this classic production planning approach explained, PBC compared to other production control concepts, and it is demonstrated that it may still be fruitfully applied, especially in combination with cellular manufacturing. It is therefore considered as a classi...

in recent years there has been studies concerning the investigation of macro-scale geomorphic proxies of quaternary climatic changes in the study area. without detail analysis of slope geomorphic features, there can be little progress on expanding the knowledge of past slope development in the northwestern iran high mountain environments. consequently, the information pertaining to these quater...

â â â  parsian alluvial fan system is a part of asyab-kharabeh fluvial system that response it to quaternary climate changes is the main goal of this study. for this aim, climatic proxies and traces in alluvial fan structure were investigated base d o n four categories: aggradation and degradation phases, debris flows, size changes in deposited materials and formation of alluvial fan tufas. pri...

BACKGROUND Metoclopramide use is associated with serious and potentially irreversible neurologic side effects. However, it is often used for questionable or unclear indications in clinical practice. OBJECTIVES To (1) determine whether an intervention targeted at the prescribing physician would increase the rate of metoclopramide discontinuation among patients prescribed the medication for que...

music in iran has a long history. in the early islamic period, music was denounced. in the umayyad period, music still faced opposition from some jurisprudents and a group of muslims. but in the next century, due to positive attitude of governments as well as scientific attitudes of many scholars and scientists of that era, arts received public attention.  the design of women was carved on clay...